<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var a = 1;
        a += 5;
        console.log(a);
        var b = 50;
        b -= 20;
        console.log(b);
        var c = 60;
        c /= 3;
        console.log(c);
        var d = 5;
        d *= 4;
        console.log(d);
        var e = 20 ;
        var f = "20";
        console.log( e == f );
        console.log( e === f );
        console.log(e < f);

    </script>
</body>
</html>